/Engine/Source/Runtime/TimeManagement/Public/TimeManagementBlueprintLibrary.h
Converts an Timecode to a string (hh:mm:ss:ff). If bForceSignDisplay then the number sign will always be prepended instead of just when expressing a negative time.
static [FString](API\Runtime\Core\Containers\FString) Conv_TimecodeToString ( const [FTimecode](API\Runtime\Core\Misc\FTimecode) & InTimecode, bool bForceSignDisplay )